Model SR715 Model SR720 LCR Meters

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MAINTENANCEAfter the fixture bracket is detached, remove the 1/4" nuts holding the fixture tothe bracket. Slide the plastic lead catcher off the mounting studs and wires. Thetwo halves of the fixture can now be removed. There are springs inside the fixtureso take care to avoid losing any parts when sliding them out of the bracket. Slowlyallow the fixture half to open and remove the springs, placing them somewheresafe. See the figure below for details on the assembly.With the fixture halves separated, cut the contact pivot rod at one end andremove the contact from the plastic housing. Remove the wire from the oldcontact. Place the new contact in the plastic housing and slide the new rod tosecure it. Center the contact on the rod and the plastic housing. Solder the rod tothe contact at both ends and in the center. Note: this requires a hot soldering ironapplies for several seconds. Insert one of the wires in the hole at the center of thecontact, near the rod, so that it will come out toward the center of the fixture.Solder it on the backside of the contact and trim the wire as short as possible.Repeat this for the remaining three contacts.To reassemble the fixture, select two housings, each with a different colored lead.Insert the coil springs in the plastic housings. Press the contacts back into theplastic housings and carefully bring the two together. Slide them into themounting bracket, making sure the black wire is on the left when viewed frombelow. Slide the plastic lead catcher over the wires and mounting studs andreplace the nuts. Repeat for the other side.To install the fixture, attach it to the PCB with the four screws. Insert the wires inthe PCB. See the figure below for the location of each wire. Replace the PCB inthe unit, replace the 12 screws for the PCB, the two screws on the bottom and the3/16" bolts for the RS232 connector. Replace the option board if present. Attachthe ribbon cable and lugged wire to the top. Replace the top, taking care to align it6-6
MAINETENANCEover the fixture and back of the unit. Finally, replace the four screws at thecorners of the unit.SURFACE MOUNT TWEEZERSCLEANINGREPLACEMENTTo clean the SMD Tweezers, rub an eraser lightly across the inside surfaces ofthe tips. Blow any residue off the tip.The tips of the tweezers may need to be replaced from time to time. Use the Allenwrench supplied with the tweezers (1/16") to remove the screw holding the tip.Slide out the old tip and replace it with a new one, making sure that the contactfaces in. Replace the Allen screw. Repeat for the other side. See the figurebelow.6-7
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User’s ManualModel SR715Model SR7
Page 3:
TABLE OF CONTENTSOutput Voltage 5-2
Page 6 and 7:
SR715/720 LCR METERGENERAL INFORMAT
Page 8 and 9:
SR715/720 LCR METEROPTIONSGPIB / Ha
Page 10 and 11:
SR715/720 LCR METERSeries and Paral
Page 12 and 13:
SR715/720 LCR METERHow the SR715/72
Page 14 and 15:
SR715/720 LCR METERSENA(?) {i} Set
Page 16 and 17:
DISPLAYGETTING STARTEDThe LED displ
Page 18 and 19:
GETTING STARTEDmode. The range can
Page 20 and 21:
GETTING STARTEDREAR PANELPOWER ENTR
Page 22 and 23:
OPERATIONSERIES and PARALLEL EQUIVA
Page 24 and 25:
OPERATIONTEST CONDITIONSDEFAULT CON
Page 26 and 27:
OPERATIONcapacitors (test voltage =
Page 28 and 29:
OPERATIONRange Change Points When A
Page 30 and 31:
OPERATIONwhere T s = settling time,
Page 32 and 33:
OPERATIONCONNECTING A DEVICEThe SR7
Page 34 and 35:
OPERATIONKELVIN CLIPSKelvin Clips p
Page 36 and 37:
OPERATIONOPEN and SHORT CIRCUIT OR
Page 38 and 39:
BINNINGOPERATIONThe SR715/720 has b
Page 40 and 41:
OPERATIONVALUES FORFAIL BINS (8 & 9
Page 42 and 43: OPERATIONOption 01: GPIB/Handler In
Page 44 and 45: ACCURACYDETAILED ACCURACY SPECIFICA
Page 46 and 47: 3-3ACCURACY
Page 48 and 49: ACCURACYL + Q ACCURACYAccuracy of L
Page 50 and 51: ACCURACYC + R ACCURACYAccuracy of C
Page 52 and 53: REMOTE PROGRAMMINGINTRODUCTIONThe S
Page 54 and 55: REMOTE PROGRAMMINGDETAILED COMMAND
Page 56 and 57: REMOTE PROGRAMMINGByte Character Me
Page 58 and 59: REMOTE PROGRAMMINGSR715/720 will us
Page 60 and 61: REMOTE PROGRAMMING8 Instrumentation
Page 62 and 63: REMOTE PROGRAMMINGSTANDARD EVENT bi
Page 64 and 65: REMOTE PROGRAMMINGexit (0);}ibwrt (
Page 66 and 67: REMOTE PROGRAMMINGTxGpib (sr720,"OU
Page 68 and 69: REMOTE PROGRAMMINGEXAMPLE PROGRAM 3
Page 70 and 71: REMOTE PROGRAMMING}printf ("bin 0 1
Page 72 and 73: REMOTE PROGRAMMINGEXAMPLE PROGRAM 4
Page 74 and 75: PERFORMANCE TESTS2. Self TestsThe i
Page 76 and 77: PERFORMANCE TESTSPERFORMANCE TESTST
Page 78 and 79: PERFORMANCE TESTSResistance Accurac
Page 80 and 81: PERFORMANCE TESTSSR715/720 PERFORMA
Page 82 and 83: CALIBRATIONINTRODUCTIONCalibration
Page 84 and 85: CALIBRATIONNecessary EquipmentInstr
Page 86 and 87: CALIBRATION3. Standard Resistor Cal
Page 88 and 89: TROUBLESHOOTINGError MessagesThe fo
Page 90 and 91: TROUBLESHOOTINGCalibration ErrorsTh
Page 94 and 95: MAINTENANCE6-8
Page 96 and 97: SR715/720 PARTS LISTREF. SRS PART#
Page 106: SR715/720 PARTS LISTMiscellaneous a
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Model SR715 Model SR720 LCR Meters

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